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flood over smt pads in PADS

Discussion in 'CAD' started by John Larkin, Mar 13, 2008.

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  1. John Larkin

    John Larkin Guest


    My regular cad guy is out sick, so I'm doing a little test board
    myself. I'm an occasional PADS user.

    Everything is going OK, except that I want to do a topside copper pour
    that floods over all the same-net surface-mount pads, without
    thermals. I know there's an obsure path to do this - I've seen him do
    it - but I can't find it. Flooding over vias is no problem, but there
    is some other trick to flooding the pads. Anybody know what it is?

    This is PCB v 5.0.


  2. John,
    It is in your general peferences settings (design, routing or something
    like that.). It is on some tab that only slightly makes sense in terms of
    polygon connection types. Look for two groups of settings side by side in
    the middle of the tab screen. Like two side-side columns. That sets the
    connection types, it can set the thermal relief style (+ or X spokes, 2 or 4
    spokes) and I believe also allow setting no thermal relief or flooding over
    your pads.

    The better question is are you sure you want to flood over your pads?
    Are you going to be able to solder them sufficiently after flooding over
    them. It's your board but direct floods over pads take a lot of heat to
    properly solder.
  3. John Larkin

    John Larkin Guest

    OK, we finally got it to work. It's a little trickier than you

    In Preferences/Thermals/Non-drilled thermals, you have to select each
    possible pad shape sequentially, and then set "flood over" mode for
    each shape!

    Production boards will be reflowed in an oven, where everything gets
    hot. But I find that a Metcal can hand-solder almost anything. This is
    GHz stuff, with really tiny parts, and the spokes just don't make


  4. Joel Koltner

    Joel Koltner Guest

    Even with the smaller tips?

    I have an MX-500, and while the larger (say, 1/8" and bigger) tips will solder
    just about anything, the tiny ones just don't seem to have enough thermal
    conductance to let you solder down, e.g., an 0402 to a ground plane.
  5. Yeah that sorta sounds right John.

    I never said it was very simple, nor optimal, I just told you where it
    was. If my memory severes me correctly, there was a flood over radio type
    button below each column, or possibly just one below both columns. Does that
    not just force a flood over of all pads regardless of shape? I can recall
    doing the different pad shape thing for setting different spoke patterns but
    I thought the flood over was more global and nto set by each pad shape. Oh
    well it has been a while since I used PADs seriously.
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